Air Conditioner Outdoor Unit

ABSTRACT

The present disclosure provides an air conditioner outdoor unit that includes: a motor having first and second output shafts; a first-stage fan blade connected to the first output shaft; a second-stage fan blade connected to the second output shaft. The motor is configured to drive the first-stage and second-stage fan blades to rotate, and rotation directions of the first-stage and second-stage fan blades are opposite. The motor is located between the first-stage and second-stage fan blades, or on the same side of the first-stage and second-stage fan blades. The outdoor unit is provided with a motor, and first-stage and second-stage fan blades, so that the motor drives the first-stage fan blade to rotate through the first output shaft, and drives the second-stage fan blade to rotate in the opposite direction through the second output shaft. By recovering the rotational energy of the airflow, higher wind pressure is achieved.

CROSS-REFEENCE TO RELATED APPLICATIONS

This application is a continuation of PCT International Application No. PCT/CN2020/132689, filed Nov. 30, 2020, which claims the benefit of Chinese patent application Ser. No. 201911366885.6, filed on Dec. 26, 2019, and Chinese Patent Application No. 201911369821.1, filed on Dec. 26, 2019, the entire contents of which are incorporated herein by reference.

FIELD

The present disclosure relates to the technical field of air conditioners, in particular, to an air conditioner outdoor unit.

BACKGROUND

In the prior art, the counter-cyclone is mainly used in coal mine ventilation, and the application case in central air conditioning is very rare. In the central air conditioner, due to the existence of overcurrent components such as the electric control box and brackets, the air flow conditions at the fan inlet are extremely complicated. Under such complex air flow conditions, the flow loss and aerodynamic noise caused by the leakage flow of the rotor tip become more and more obvious.

SUMMARY

The present disclosure aims to solve at least one of the technical problems existing in the prior art or related art.

To this end, the purpose of the present disclosure is to provide an air conditioner outdoor unit.

In view of this, a purpose of the present disclosure provides an air conditioner outdoor unit, comprising: a motor, being provided with a first output shaft and a second output shaft; a first-stage fan blade, being connected to the first output shaft; a second-stage fan blade, being connected to the second output shaft; shell, being provided with an outlet, the first-stage fan blade and the second-stage fan blade being located at the outlet, the first-stage fan blade being an upstream fan blade, and the second-stage fan blade being a downstream fan blade; and a motor bracket, being connected to the shell, and the motor being arranged on the motor bracket, wherein, the motor is configured to drive the first-stage fan blade and the second-stage fan blade to rotate, and rotation directions of the first-stage fan blade and the second-stage fan blade are opposite; and the motor is located between the first-stage fan blade and the second-stage fan blade; or the motor is located on the same side of the first-stage fan blade and the second-stage fan blade.

The air conditioner outdoor unit provided by the present disclosure is provided with a motor, a first-stage fan blade, a second-stage fan blade and a motor bracket, so that the motor drives the first-stage fan blade to rotate through the first output shaft, and drives the second-stage fan blade to rotate in the opposite direction through the second output shaft to form a counter-cyclone. Furthermore, the counter-cyclone is arranged at the outlet of the shell; use the first-stage fan blade as the upstream fan blade and the second-stage fan blade as the downstream fan blade. Through the counter-rotation work of the upstream fan blade and the downstream fan blade, the wind pressure and resistance to wind are improved, the air supply is smoother, and the probability of backflow is reduced.

Specifically, the same motor has a first output shaft and a second output shaft, which realizes the direct driving of two output shafts by one motor, and makes the motor structure compact and space-saving. The first-stage fan blade and the second-stage fan blade are respectively connected with the first output shaft and the second output shaft, so that the motor drives the first-stage fan blade and the second-stage fan blade simultaneously through the first output shaft and the second output shaft respectively. By making the first-stage fan blade and the second-stage fan blade rotate in opposite directions, that is, the counter-rotation design of the two-stage fan blade is adopted, so that the motor performance is enhanced. At the same time, the speed of the first-stage fan blade and the second-stage fan blade is significantly lower than that of the single axial flow fan of the same level, which increases the service life and reduces the high-strength requirement of the fan blade structure at high speed. These settings enable the airflow to be accelerated and pressurized under the combined action of the two-stage fan blade when passing through the outdoor unit, thereby enhancing the wind force, and improving the resistance to wind, thereby greatly enhancing the exhaust capability of the airflow through the external exhaust duct.

Specifically, one implementation is to set the motor in the middle of the first-stage fan blade and the second-stage fan blade, and the first-stage fan blade and the second-stage fan blade are distributed on both sides of the motor. One implementation is to set the motor on the same side of the first-stage fan blade and the second-stage fan blade, that is, both the first-stage fan blade and the second-stage fan blade are located on the same side of the motor. By enabling different installation methods to meet the needs of different working conditions, it is possible to adjust the relative positions of the motor and the two-stage fan blade according to the size of the interior space of the outdoor unit without affecting the performance, thereby ensuring a reasonable structural layout. Furthermore, the motor bracket is used to support and fix the motor to ensure the safe and stable operation of the motor. The motor bracket is connected to the shell according to the actual situation, which ensures the reasonable layout of the structure.

In addition, because the rotation directions of the first-stage fan blade and the second-stage fan blade are opposite, the torque acting on the rotating shaft is relatively balanced, which reduces the vibration of the machine body and the noise caused by vibration, thereby improving the user experience.

In addition, the air conditioner outdoor unit in the above-mentioned embodiments provided by the present disclosure may also have the following additional technical features.

In the above-mentioned embodiments, furthermore, a rotation axis of the first output shaft and a rotation axis of the second output shaft are collinear.

In any one of the above-mentioned embodiments, furthermore, the first output shaft is a hollow shaft, and the second output shaft passes through the hollow shaft.

In any one of the above-mentioned embodiments, furthermore, a rotation speed ratio of the second output shaft and the first output shaft ranges from 0.5 to 2.

In any one of the above-mentioned embodiments, furthermore, the air conditioner outdoor unit further comprises a wind guide ring, being arranged at the outlet, and the first-stage fan blade and the second-stage fan blade are arranged in the wind guide ring.

In any one of the above-mentioned embodiments, furthermore, the wind guide ring comprises: a wind ring main body, one end of the wind ring main body forming an air outlet; and a contraction portion, being connected to another end of the wind ring main body, and a transition arc being formed between the contraction portion and the wind ring main body, wherein, a circle center of the transition arc is located outside the wind guide ring.

In any one of the above-mentioned embodiments, furthermore, along an axial direction of the output shaft, 10% to 90% of a height of the first-stage fan blade is located in the wind ring main body.

In any one of the above-mentioned embodiments, furthermore, taking a direction perpendicular to the rotation axis of the first-stage fan blade as a radial direction of the first-stage fan blade, along the radial direction of the first-stage fan blade, a distance from a tip of the first-stage fan blade to an axis of the first-stage fan blade is L1, a corresponding radius of the transition arc ranges from 0.01×L1 to 2×L1.

In any one of the above-mentioned embodiments, furthermore, taking a direction perpendicular to the rotation axis of the first-stage fan blade as a radial direction of the first-stage fan blade, along the radial direction of the first-stage fan blade, a distance from a tip of the first-stage fan blade to an axis of the first-stage fan blade is L1; and taking a direction perpendicular to the rotation axis of the second-stage fan blade as a radial direction of the second-stage fan blade, along the radial direction of the second-stage fan blade, a distance from a tip of the second-stage fan blade to an axis of the second-stage fan blade is L2, an axial distance between the first-stage fan blade and the motor bracket ranges from 5 mm to 2×L1; or an axial distance between the second-stage fan blade and the motor bracket ranges from 5 mm to 2×L2.

In any one of the above-mentioned embodiments, furthermore, taking a direction perpendicular to the rotation axis of the first-stage fan blade as a radial direction of the first-stage fan blade, along the radial direction of the first-stage fan blade, a distance from a tip of the first-stage fan blade to an axis of the first-stage fan blade is L1; and taking a direction perpendicular to the rotation axis of the second-stage fan blade as a radial direction of the second-stage fan blade, along the radial direction of the second-stage fan blade, a distance from a tip of the second-stage fan blade to an axis of the second-stage fan blade is L2, along the radial direction of the first-stage fan blade, a distance from the tip of the first-stage fan blade to the wind guide ring ranges from 0.01×L1 to 0.1×L1; and/or along the radial direction of the second-stage fan blade, a distance from the tip of the second-stage fan blade to the wind guide ring ranges from 0.01×L2 to 0.1×L2.

In any one of the above-mentioned embodiments, furthermore, the wind guide ring further comprises an expansion portion, being connected to another end of the wind ring main body.

In any one of the above-mentioned embodiments, furthermore, the air conditioner outdoor unit further comprises a mesh cover, being arranged at the air outlet of the wind guide ring.

In any one of the above-mentioned embodiments, furthermore, the air conditioner outdoor unit further comprises a heat exchanger, being arranged in the shell, and the heat exchanger being located between an air inlet and an outlet of the shell, the electric control component is arranged on the shell.

In any one of the above-mentioned embodiments, furthermore, along the axial direction of the output shaft, a distance between the electric control component and the motor bracket is greater than 0.02×L1.

In any one of the above-mentioned embodiments, furthermore, the outdoor unit further comprises a third-stage fan blade, be arranged on the wind guide ring and located at the air outlet of the wind guide ring.

In any one of the above-mentioned embodiments, furthermore, taking a direction perpendicular to the rotation axis of the first-stage fan blade as a radial direction of the first-stage fan blade, along the radial direction of the first-stage fan blade, a distance from a tip of the first-stage fan blade to an axis of the first-stage fan blade is L1; and taking a direction perpendicular to the rotation axis of the second-stage fan blade as a radial direction of the second-stage fan blade, along the radial direction of the second-stage fan blade, a distance from a tip of the second-stage fan blade to an axis of the second-stage fan blade is L2, an axial distance between the first-stage fan blade and the second-stage fan blade ranges from 0.02×L1 to 2×L1; or an axial distance between the first-stage fan blade and the second-stage fan blade ranges from 0.02×L2 to 2×L2.

The first aspect of the present disclosure provides an air conditioner outdoor unit, comprising: a first motor; a first-stage fan blade, being connected with an output shaft of the first motor, and the first motor being configured to drive the first-stage fan blade to rotate; a second motor, a rotation axis of the output shaft of the first motor and a rotation axis of the output shaft of the second motor being collinear; a second-stage fan blade, being connected with the output shaft of the second motor, the second motor being configured to drive the second-stage fan blade to rotate, a rotation direction of the first-stage fan blade being opposite to a rotation direction of the second-stage fan blade; a shell, being provided with an outlet, the first-stage fan blade and the second-stage fan blade being located at the outlet, the first-stage fan blade being an upstream fan blade, and the second-stage fan blade being a downstream fan blade; a first motor bracket, the first motor being arranged on the first motor bracket, and the first motor bracket being connected with the shell; and a second motor bracket, the second motor being arranged on the second motor bracket, and the second motor bracket being connected with the shell, wherein, the first motor bracket is located on the same side of the first-stage fan blade and the second-stage fan blade; or the first motor bracket is located between the first-stage fan blade and the second-stage fan blade, the second motor bracket is located on the same side of the first-stage fan blade and the second-stage fan blade; or the second motor bracket is located between the first-stage fan blade and the second-stage fan blade.

The air conditioner outdoor unit provided by the present disclosure is provided with the first motor, the first-stage fan blade, the second motor and the second-stage fan blade, the first motor bracket and the second motor bracket, so that the first motor drives the first-stage fan blade to rotate, the second motor drives the second-stage fan blade to rotate in reverse. And because the rotation axes of the output shafts of the first motor and the second motor are collinear, the series arrangement of the two-stage fan blades is realized, and the counter-cyclone of the relative reverse rotation (hereinafter referred to as the counter-rotation) of the first-stage fan blade and the second-stage fan blade is formed. Furthermore, the counter-cyclone is set at the outlet of the shell, the first-stage fan blade is used as the upstream fan blade, and the second-stage fan blade is used as the downstream fan blade, and through the counter-rotation work of the upstream fan blade and the downstream fan blade, the wind pressure and resistance to wind are improved, the air supply is smoother, and the probability of backflow is reduced.

Specifically, by adopting the counter-rotation design of the two-stage fan blade, the performance of the motor is enhanced, and at the same time, the rotational speed of the first-stage fan blade and the second-stage fan blade is significantly lower than that of the single axial flow fan of the same level, which increases the service life and reduces the high strength requirement of the fan blade structure at high rotational speed. With these settings, the airflow is accelerated and supercharged by the combined action of the two-stage fan blade when passing through the air conditioner outdoor unit, so that the wind is strengthened, and improve the resistance to wind, thereby greatly enhancing the exhaust ability of the airflow through the external exhaust duct.

In addition, because the rotation directions of the first-stage fan blade and the second-stage fan blade are opposite, the torque acting on the rotating shaft is relatively balanced, which reduces the vibration of the machine body and the noise caused by vibration, thereby improving the user experience.

Furthermore, the motor bracket is used to support and fix the motor. By setting the first motor bracket on the same side of the first-stage fan blade and the second-stage fan blade or between the first-stage fan blade and the second-stage fan blade, and setting the second motor bracket on the same side of the first-stage fan blade and the second-stage fan blade or between the first-stage fan blade and second-stage fan blade, thereby the relative positions of the motor and the two-stage fan blade can be adjusted according to the size of the interior space of the air conditioner outdoor unit without affecting the performance, thereby ensuring a reasonable structural layout, and improving the stability of the motor bracket installation by connecting the first motor bracket and the second motor bracket to the shell.

In addition, the air conditioner outdoor unit in the above-mentioned embodiments provided by the present disclosure may also have the following additional technical features.

In the above-mentioned embodiments, furthermore, the air conditioner outdoor unit further comprises a wind guide ring, being arranged at the outlet, and the first-stage fan blade and the second-stage fan blade being located in the wind guide ring.

In any one of the above-mentioned embodiments, furthermore, the wind guide ring comprises: a wind ring main body, one end of the wind ring main body forming an air outlet; and a contraction portion, one end of the contraction portion being connected with another end of the wind ring main body, and a transition arc being formed between the contraction portion and the wind ring main body, wherein, a circle center of the transition arc is located outside the wind guide ring.

In any one of the above-mentioned embodiments, furthermore, along an axial direction of the output shaft, 10% to 90% of a height of the first-stage fan blade is located in the wind ring main body; and/or along the axial direction of the output shaft, the second-stage fan blade is located in the wind ring main body.

In any one of the above-mentioned embodiments, furthermore, taking a direction perpendicular to the rotation axis of the first-stage fan blade as a radial direction of the first-stage fan blade, along the radial direction of the first-stage fan blade, a distance from a tip of the first-stage fan blade to an axis of the first-stage fan blade is L1; taking a direction perpendicular to the rotation axis of the second-stage fan blade as a radial direction of the second-stage fan blade, along the radial direction of the second-stage fan blade, a distance from a tip of the second-stage fan blade to an axis of the second-stage fan blade is L2; an axial distance between the first-stage fan blade and the second-stage fan blade ranges from 0.02×L1 to 2×L1; or an axial distance between the first-stage fan blade and the second-stage fan blade ranges from 0.02×L2 to 2×L2.

In any one of the above-mentioned embodiments, furthermore, an axial distance between the first-stage fan blade and the first motor bracket ranges from 5 mm to 2×L1; or an axial distance between the second-stage fan blade and the second motor bracket ranges from 5 mm to 2×L2.

In any one of the above-mentioned embodiments, furthermore, taking a direction perpendicular to the rotation axis of the first-stage fan blade as a radial direction of the first-stage fan blade, along the radial direction of the first-stage fan blade, a distance from a tip of the first-stage fan blade to an axis of the first-stage fan blade is L1; and taking a direction perpendicular to the rotation axis of the second-stage fan blade as a radial direction of the second-stage fan blade, along the radial direction of the second-stage fan blade, a distance from a tip of the second-stage fan blade to an axis of the second-stage fan blade is L2, along the radial direction of the first-stage fan blade, a distance from the tip of the first-stage fan blade to the wind guide ring ranges from 0.01×L1 to 0.1×L1; and/or along the radial direction of the second-stage fan blade, a distance from the tip of the second-stage fan blade to the wind guide ring ranges from 0.01×L2 to 0.1×L2.

In any one of the above-mentioned embodiments, furthermore, taking a direction perpendicular to the rotation axis of the first-stage fan blade as a radial direction of the first-stage fan blade, along the radial direction of the first-stage fan blade, a distance from a tip of the first-stage fan blade to an axis of the first-stage fan blade is L1, a corresponding radius of the transition arc ranges from 0.01×L1 to 2×L1.

In any one of the above-mentioned embodiments, furthermore, the air outlet of the wind guide ring is provided with an expansion portion extending outside the wind guide ring, when the second motor bracket is located on the same side of the first-stage fan blade and the second-stage fan blade, the second motor bracket is located outside the wind guide ring.

In any one of the above-mentioned embodiments, furthermore, the air conditioner outdoor unit further comprises a mesh cover, being provided at the air outlet of the wind guide ring.

In any one of the above-mentioned embodiments, furthermore, based on a fact that the second motor bracket is located on the same side of the first-stage fan blade and the second-stage fan blade, the second motor bracket and the mesh cover are an integral structure.

In any one of the above-mentioned embodiments, furthermore, the air conditioner outdoor unit further comprises a shell cover, being connected with the shell and covered on the air outlet of the wind guide ring, and the mesh cover being arranged on the shell cover. When the second motor bracket is located on the same side of the first-stage fan blade and second-stage fan blade, the second motor bracket is located inside the shell cover.

In any one of the above-mentioned embodiments, furthermore, the air conditioner outdoor unit further comprises a heat exchanger, being arranged in the shell, and the heat exchanger being located between an air inlet and an outlet of the shell; and an electric control component, being arranged in the shell.

In any one of the above-mentioned embodiments, furthermore, taking a direction perpendicular to the rotation axis of the first-stage fan blade as a radial direction of the first-stage fan blade, along the radial direction of the first-stage fan blade, a distance from a tip of the first-stage fan blade to an axis of the first-stage fan blade is L1, along the axial direction of the output shaft, a distance between the electric control component and the first motor bracket is greater than 0.02×L1.

In any one of the above-mentioned embodiments, furthermore, the outdoor unit further comprises a third-stage fan blade, being arranged on the wind guide ring, and located at the air outlet of the wind guide ring.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and/or additional aspects and advantages of the present disclosure will become apparent and readily understood from the description of embodiments in conjunction with the following drawings:

FIG. 1 is a schematic structural diagram of an air conditioner outdoor unit (without mesh cover) of some embodiments of the present disclosure, and the straight arrow in the figure indicates the direction of airflow.

FIG. 2 is a top view of FIG. 1 (comprising mesh cover).

FIG. 3 is a top view of FIG. 1 (without mesh cover).

FIG. 4 is the three-dimensional schematic structural diagram of FIG. 1 (without mesh cover).

FIG. 5 is a schematic cross-sectional view of a part of structure in the direction A-A in FIG. 2.

FIG. 6 is a schematic cross-sectional view of a part of structure in the direction B-B in FIG. 2.

FIG. 7 is a schematic structural diagram of a motor of an air conditioner outdoor unit shown in FIG. 1.

FIG. 8 is a schematic structural diagram of a counter-cyclone of an air conditioner outdoor unit shown in FIG. 1, and the arrow in the figure indicates the airflow direction.

FIG. 9 is a schematic structural diagram of an air conditioner outdoor unit of other embodiments of the present disclosure, and the straight arrow in the figure indicates the airflow direction.

FIG. 10 is a top view of FIG. 9 (without mesh cover).

FIG. 11 is a three-dimensional schematic structural diagram of an air conditioner outdoor unit shown in FIG. 9.

FIG. 12 is a partial schematic structural diagram of an air conditioner outdoor unit shown in FIG. 9.

FIG. 13 is a schematic structural diagram of FIG. 12 in the direction C-C.

FIG. 14 is a schematic structural diagram of a counter-cyclone of an air conditioner outdoor unit shown in FIG. 9, and the arrow in the figure indicates the airflow direction.

The corresponding relationship between the reference signs and component names in FIG. 1 to FIG. 14 is as follows:

1 air conditioner outdoor unit, 100 motor, 102 first output shaft, 104 second output shaft, 200 first-stage fan blade, 300 second-stage fan blade, 110 first motor, 120 second motor, 310 first motor bracket, 320 second motor bracket, 400 wind guide ring, 412 wind ring main body, 414 contraction portion, 416 expansion portion, 500 motor bracket, 600 shell, 700 heat exchanger, 800 electric control component, 900 mesh cover, 902 shell cover.

DETAILED DESCRIPTION OF THE DISCLOSURE

In order that the above-mentioned objectives, features and advantages of the present disclosure can be understood more clearly, a further detailed description of the present disclosure will be given below in connection with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present disclosure and the features in the embodiments can be combined with each other if there is no conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present disclosure. However, the present disclosure can also be implemented in other manners than those described herein. Therefore, the protection scope of the present disclosure is not limited to the specific embodiments disclosed below.

The air conditioner outdoor unit 1 provided according to the first embodiments of the present disclosure is described below with reference to FIG. 1 to FIG. 8.

As shown in FIG. 1, some embodiments of the first aspect of the present disclosure provides an air conditioner outdoor unit 1 comprising a motor 100, a first-stage fan blade 200, a second-stage fan blade 300, a shell 600, and a motor bracket 500.

Wherein, the motor 100 is provided with a first output shaft 102 and a second output shaft 104; the first-stage fan blade 200 is connected to the first output shaft 102; the second-stage fan blade 300 is connected to the second output shaft 104; the shell 600 is provided with an outlet, the first-stage fan blade 200 and the second-stage fan blade 300 are located at the outlet, the first-stage fan blade 200 is an upstream fan blade, and the second-stage fan blade 300 is a downstream fan blade; and the motor bracket 500 is connected to the shell 600, and the motor 100 is arranged on the motor bracket 500, wherein, the motor 100 is configured to drive the first-stage fan blade 200 and the second-stage fan blade 300 to rotate, and rotation directions of the first-stage fan blade 200 and the second-stage fan blade 300 are opposite.

The air conditioner outdoor unit 1 provided by the present disclosure is provided with a motor 100, a first-stage fan blade 200, a second-stage fan blade 300 and a motor bracket 500, so that the motor 100 drives the first-stage fan blade 200 to rotate through the first output shaft 102, and drives the second-stage fan blade 300 to rotate in the opposite direction through the second output shaft 104 to form a counter-cyclone. Further, the counter-cyclone is arranged at the outlet of the shell 600; use the first-stage fan blade 200 as the upstream fan blade and the second-stage fan blade 300 as the downstream fan blade. Through the counter-rotation work of the upstream fan blade and the downstream fan blade, therefore, the rotational energy of the airflow is recovered to achieve greater wind pressure.

Specifically, the same motor 100 has a first output shaft 102 and a second output shaft 104, which realizes the direct driving of two output shafts by one motor 100, and makes the structure of the motor 100 compact and space-saving. The first-stage fan blade 200 and the second-stage fan blade 300 are respectively connected with the first output shaft 102 and the second output shaft 104, so that the motor 100 drives the first-stage fan blade 200 and the second-stage fan blade 300 simultaneously through the first output shaft 102 and the second output shaft 104 respectively. By making the first-stage fan blade 200 and the second-stage fan blade 300 rotate in opposite directions, that is, the counter-rotation design of the two-stage fan blade is adopted, so that the performance of the motor 100 is enhanced. At the same time, the speed of the first-stage fan blade 200 and the second-stage fan blade 300 is significantly lower than that of the single axial flow fan of the same level, which increases the service life and reduces the high-strength requirement of the fan blade structure at high speed. These settings enable the airflow to be pressurized under the combined action of the two-stage fan blade when passing through the outdoor unit 1, thereby enhancing the wind force, and improving the resistance to wind, thereby greatly enhancing the exhaust capability of the airflow through the external exhaust duct.

In addition, since the rotation directions of the first-stage fan blade 200 and the second-stage fan blade 300 are opposite, the torque acting on the rotating shaft is relatively balanced, which reduces the vibration of the machine body and the noise caused by the vibration, thereby improving the user experience.

Furthermore, an embodiments is shown in FIG. 8, the motor 100 is arranged on the same side of the first-stage fan blade 200 and the second-stage fan blade 300, that is, both the first-stage fan blade and the second-stage fan blade are on the same side of the motor. It is also possible to make the first output shaft 102 and the second output shaft 104 has different rotational speeds and turns. Specifically, the second output shaft 104 may be a hollow shaft or a solid shaft. Specifically, the motor can be located at the air inlet end or air outlet end of the counter-cyclone.

Furthermore, the motor can also be set in the middle of the first-stage fan blade 200 and the second-stage fan blade 300, and the first-stage fan blade 200 and the second-stage fan blade 300 are distributed on both sides of the motor 100 (not shown in the figure).

By enabling different installation methods to meet the needs of different working conditions, it is possible to adjust the relative positions of the motor 100 and the two-stage fan blade according to the size of the interior space of the air conditioner outdoor unit 1 without affecting the performance, thereby ensuring a reasonable structural layout.

Furthermore, as shown in FIG. 1 and FIG. 8, the motor bracket 500 is connected with the shell 600, and the motor 100 is arranged on the motor bracket 500. The motor bracket 500 is used to support and fix the motor 100 to ensure the safe and stable operation of the motor 100. The motor bracket 500 is connected to the shell 600 according to the actual situation, which ensures the reasonable layout of the structure.

Specifically, both ends of the motor bracket 500 are fixedly connected to the shell, furthermore, both ends of the motor bracket 500 are provided with mounting holes, which are fixed on the shell by screws.

Furthermore, as shown in FIG. 1, FIG. 5 to FIG. 8, some embodiments of the present disclosure provides an air conditioner outdoor unit 1, comprising a motor 100, a first-stage fan blade 200, a second-stage fan blade 300, a shell 600 and a motor bracket 500.

Wherein, the motor 100 is provided with a first output shaft 102 and a second output shaft 104; the first-stage fan blade 200 is connected with the first output shaft 102; the second-stage fan blade 300 is connected with the second output shaft 104. The motor 100 is configured to drive the rotation of the first-stage fan blade 200 and the second-stage fan blade 300, the rotation directions of the first-stage fan blade 200 and the second-stage fan blade 300 are opposite.

Furthermore, the rotation axis of the first output shaft 102 and the rotation axis of the second output shaft 104 are collinear, which realizes the serial arrangement of the first-stage fan blade 200 and the second-stage fan blade 300, so that after the airflow is accelerated by the first-stage fan blade 200, then the second-stage fan blade 300 is used for pressurization, so that the wind pressure is higher and the wind resistance is strong.

Specifically, in some embodiments as shown in FIG. 8, the motor 100 is set on the same side of the first-stage fan blade 200 and the second-stage fan blade 300, that is, both the first-stage fan blade and the second-stage fan blade are on the same side of the motor. In the embodiments shown in FIG. 7, the first output shaft 102 is a hollow shaft; the second output shaft 104 is passed through the hollow shaft to make the structure more compact, and the first output shaft 102 and the second output shaft 104 can have different rotation speed and steering. Specifically, the second output shaft 104 may be a hollow shaft or a solid shaft.

Specifically, the motor can also be set in the middle of the first-stage fan blade 200 and the second-stage fan blade 300, and the first-stage fan blade 200 and the second-stage fan blade 300 are distributed on both sides of the motor 100 (not shown in the figure).

By enabling different installation methods to meet the needs of different working conditions, it is possible to adjust the relative positions of the motor 100 and the two-stage fan blade according to the size of the interior space of the air conditioner outdoor unit 1 without affecting the performance, thereby ensuring a reasonable structural layout.

Furthermore, the rotation speed ratio of the second output shaft 104 and the first output shaft 102 is limited between 0.5 and 2, so that the first-stage fan blade 200 and the second-stage fan blade 300 have different rotation speeds respectively, which changes the state of the airflow when passing through, thereby achieving the purpose of increasing the wind pressure.

Furthermore, as shown in FIG. 4, setting a direction perpendicular to the rotation axis of the first-stage fan blade 200 as a radial direction of the first-stage fan blade 200, along the radial direction of the first-stage fan blade 200, a distance from a tip of the first-stage fan blade 200 to an axis of the first-stage fan blade 200 is L1.

Setting a direction perpendicular to the rotation axis of the second-stage fan blade 300 as a radial direction of the second-stage fan blade 300, along the radial direction of the second-stage fan blade 300, a distance from a tip of the second-stage fan blade 300 to an axis of the second-stage fan blade 300 is L2.

Specifically, along the radial direction of the first-stage fan blade 200, the distance from the tip of the first-stage fan blade 200 to the axis of the first-stage fan blade 200 is L1 means that when projecting the first-stage fan blade 200 along the axial direction of the first-stage fan blade 200, the radius R corresponding to the circle with the largest radius formed in the projected contour line of the first-stage fan blade 200 is the distance L1 from the tip of the first-stage fan blade 200 to the axis of the first-stage fan blade 200.

Specifically, along the radial direction of the second-stage fan blade 300, the distance from the tip of the second-stage fan blade 300 to the axis of the second-stage fan blade 300 is L2 means that When projecting the second-stage fan blade 300 along the axial direction of the second-stage fan blade 300, the radius R corresponding to the circle with the largest radius formed in the projected outline of the second-stage fan blade 300 is the distance L2 from the tip of the second-stage fan blade 300 to the axis of the second-stage fan blade 300.

Specifically, as shown in FIG. 3, the distance L1 from the tip of the first-stage fan blade 200 to the axis of the first-stage fan blade 200 can be set to be the same as the distance L2 from the tip of the second-stage fan blade 300 to the axis of the second-stage fan blade 300 to reduce the production mold and reduce the production cost.

Setting an axial distance between the first-stage fan blade 200 and the second-stage fan blade 300 ranges from 0.02×L1 to 2×L1; or an axial distance between the first-stage fan blade 200 and the second-stage fan blade 300 ranges from 0.02×L2 to 2×L2. As shown in FIG. 5, along the air intake direction, the first fan blade comprises the leading edge and the trailing edge, the second-stage fan blade comprises the leading edge and the trailing edge, the axial distance L3 between the first-stage fan blade 200 and the second-stage fan blade 300 is the distance between the trailing edge of the first-stage fan blade 200 and the leading edge of the second-stage fan blade 300. The reasonable setting of the axial distance makes the axial spacing of the two-stage fan blades have sufficient distance to avoid the possible interference of the two-stage fan blades, and at the same time the performance degradation and other structural problems caused by the excessive axial spacing of the two-stage fan blades are avoided.

Furthermore, setting an axial distance between the first-stage fan blade 200 and the second-stage fan blade 300 ranges from 0.05×L1 to 0.3×L1; or an axial distance between the first-stage fan blade 200 and the second-stage fan blade 300 ranges from 0.05×L2 to 0.3×L2.

As shown in FIG. 1 to FIG. 4, in any one of the above-mentioned embodiments, furthermore, the air conditioner outdoor unit 1 further comprises a wind guide ring 400.

Wherein, the wind guide ring 400 is arranged at the outlet of the shell 600, and the first-stage fan blade 200 and the second-stage fan blade 300 are located in the wind guide ring 400.

In these embodiments, the shell 600 is used to protect the internal structure of the air conditioner outdoor unit 1 from being damaged by external forces. The outlet of the shell 600 is provided with a wind guide ring 400, and the first-stage fan blade 200 and the second-stage fan blade 300 are set in the wind guide ring 400, so that when the airflow passes through the wind guide ring 400, it reaches the outlet after the wind pressure increases through the action of the two-stage fan blade.

Specifically, along the direction perpendicular to the rotation axis of the first-stage fan blade, project onto the rotation axis, the projection of the second-stage fan blade is completely within the projection of the wind guide ring, and the projection of the first-stage fan blade at least partially falls within the wind guide ring.

Furthermore, the wind guide ring 400 comprises a wind ring main body 412 and a contraction portion 414. Specifically, as shown in FIG. 6, one end of the wind ring main body 412 forms an air outlet end, and the second-stage fan blade 300 is arranged on one side of the wind ring main body 412 close to the air outlet end as a downstream fan blade. The contraction portion 414 is connected with another end of the wind ring main body 412, and forms a transition arc with the wind ring main body 412, which makes the airflow smoothly.

Furthermore, wind ring main body 412 has a straight cylindrical shape.

Furthermore, the wind guide ring 400 is arranged at the outlet of the shell 600, and can be connected to the outlet of the shell 600 through the wind ring main body 412, so that the contraction portion 414 is located in the shell 600. It can also be connected to the outlet of the shell 600 through the contraction portion 414; the inlet end of the contraction portion 414 is located in the shell 600. The specific installation method can be designed according to the model of the entire air conditioner outdoor unit 1 to adapt to more use environments.

Furthermore, along the axial direction of the output shaft, 10% to 90% of the height of the first-stage fan blade 200 is located in the wind ring main body 412. Specifically, 10% to 90% of the height of the first-stage fan blade 200 is located in the wind ring main body 412 means that along the direction perpendicular to the axial direction, project both the first-stage fan blade 200 and the wind ring main body 412 onto its rotation axis, 10% to 90% of the projection height of the first-stage fan blade 200 on the rotation axis is located in the projection of the wind ring main body 412. When the internal space is limited, the wind ring main body 412 can cover at least a small part of the height of the first-stage fan blade 200 opposite to it, so as to meet the minimum requirement for air supply efficiency, or when the internal space is not limited, the wind ring main body 412 can cover most of the height of the first-stage fan blade 200 opposite to it, ensuring higher air supply efficiency.

Specifically, the height of the first-stage fan blade 200 means that the projected length of the first-stage fan blade 200 on its rotation axis along the radial direction of the first-stage fan blade 200.

Furthermore, as shown in FIG. 5, the circle center of the transition arc of the contraction portion 414 is set outside the wind guide ring 400, so that the wind inlet end of the wind guide ring 400 expands outward, which is beneficial to the collection and introduction of the airflow.

Furthermore, the value range of the corresponding radius of the transition arc is defined to be 0.01×L1 to 2×L1, so that the contraction portion 414 of the wind guide ring 400 maintains an outwardly expanded shape, which is beneficial to the collection and introduction of airflow.

Furthermore, the value range of the corresponding radius r of the transition arc is defined to be 0.1×L1 to 0.5×L1, which is beneficial to the collection and introduction of airflow.

Specifically, the motor bracket 500 can also be fixedly connected with the wind guide ring 400, and the motor bracket 500 can be fixed on the wind guide ring through screws or bolts.

Furthermore, setting an axial distance between the first-stage fan blade 200 and the motor bracket 500 ranges from 5 mm to 2×L1; or an axial distance between the second-stage fan blade 300 and the motor bracket 500 ranges from 5 mm to 2×L2. It can be considered that the axial distance between the fan blade and the motor bracket 500 is the shortest distance between the peripheral edge of the fan blade and the projection of the plane of the motor bracket 500 opposite to it on the axis of the output shaft. By setting a reasonable axial distance, the fan blade and the motor bracket 500 have a sufficient distance to avoid possible interference between the fan blade and the motor bracket 500, and the length of the output shaft of the motor 100 is limited to prevent the output shaft from protruding too long, which may cause eccentricity. When the motor 100 is located between the two-stage fan blades, the distance between the two-stage fan blades and the motor bracket 500 should be limited respectively. When the motor 100 is located on the same side of the two-stage fan blades, just limit the distance between the fan blade close to the motor 100 and the motor bracket 500. As shown in FIG. 5, the first-stage fan blade 200 is arranged close to the motor bracket 500, and the axial distance between the first-stage fan blade 200 and the motor bracket 500 is L4.

Furthermore, setting an axial distance between the first-stage fan blade 200 and the motor bracket 500 ranges from 5 mm to 0.5×L1; or an axial distance between the second-stage fan blade 300 and the motor bracket 500 ranges from 5 mm to 0.5×L2.

Specifically, the motor bracket can also be arranged on the air outlet end of the wind guide ring, and is not limited to the embodiments shown in FIG. 5 and FIG. 6.

Furthermore, as shown in FIG. 5, FIG. 6 and FIG. 8, along the direction perpendicular to the rotation axis of the first-stage fan blade 200, the distance B1 from the tip of the first-stage fan blade 200 to the wind guide ring 400 ranges from 0.01×L1 to 0.1×L1; and/or along the radial direction of the second-stage fan blade 300, the distance B2 between the tip of the second-stage fan blade 300 to the wind guide ring 400 ranges from 0.01×L2 to 0.1×L2. The setting of this value range avoids the possible interference between the fan blade and the wind guide ring 400 due to the distance being too close, and the efficiency of the fan may decrease due to the distance being too far.

Furthermore, setting the distance B1 from the tip of the first-stage fan blade 200 to the wind guide ring 400 ranges from 0.025×L1 to 0.055×L1; and/or along the radial direction of the second-stage fan blade 300, the distance B2 between the tip of the second-stage fan blade 300 and the wind guide ring 400 ranges from 0.025×L2 to 0.055×L2.

Furthermore, the air outlet end of the wind guide ring 400 is provided with an expansion portion 416 extending outside the wind guide ring 400, so that the airflow will expand outward when passing through the air outlet end. Furthermore, the wind speed is reduced, the resistance is reduced, and the energy loss is reduced, which facilitates the recovery of dynamic pressure and improves the air supply efficiency.

As shown in FIG. 1 and FIG. 2, in any one of the above-mentioned embodiments, furthermore, the air conditioner outdoor unit 1 further comprises a mesh cover 900, and the mesh cover 900 is arranged at the air outlet end of the wind guide ring 400.

In these embodiments, the mesh cover 900 is arranged at the air outlet end of the wind guide ring 400, on one hand, it prevents external debris from entering the wind guide ring 400 and causes abnormal operation of the fan, and effectively protects the components inside the wind guide ring 400 from damage. On the other hand, it avoids the danger of people or other animals touching the fan when the air conditioner outdoor unit 1 is working, thereby improving the safety of the air conditioner outdoor unit 1.

Furthermore, as shown in the FIG. 1 and FIG. 4, the air conditioner outdoor unit 1 further comprises a heat exchanger 700 and an electric control component 800. Specifically, the heat exchanger 700 is located between the air inlet and outlet of shell 600, and the heat exchangers 700 are correspondingly arranged on three sides of the shell 600, so that the airflow can enter the air conditioner outdoor unit 1 through the heat exchangers 700 from multiple directions, which improves the air supply efficiency. The electric control component 800 is provided on the shell 600.

Specifically, as shown in FIG. 1 and FIG. 4, the front, left and right sides of the whole air conditioner outdoor unit 1 are equipped with heat exchangers 700, and the electric control component 800 is set on the backplane, which realizes air intake from three sides, and it is discharged from the wind guide ring to improve the working efficiency of the air conditioner outdoor unit.

Furthermore, the setting position of the electric control component can be set at the lower part of the backplane, and a heat exchanger 700 can be added to the upper part of the backplane, so that the air conditioner outdoor unit can be supplied with air from all sides.

Specifically, as shown in FIG. 1 to FIG. 4, the air conditioner outdoor unit 1 has side air inlet and top air outlet. In the specific implementation, the air outlet can also be set on the side of the shell, so as to realize the air inlet from the top and the other sides. The specific structure can be set according to the specific situation, and is not limited to this.

Specifically, the electric control component 800 is arranged outside the shell 600, or at least a part thereof is arranged outside the shell 600.

Furthermore, as shown in FIG. 5 or FIG. 6, along the axial direction of the output shaft, the distance between the electric control component 800 and the motor bracket 500 is set to be greater than 0.02×L1, so as to avoid the reduction of air supply efficiency due to obstruction of airflow.

Furthermore, the distance between the electric control component 800 and the motor bracket 500 is greater than 0.1×L1.

In the specific embodiments, the structure of the air conditioner outdoor unit 1 is shown in FIG. 1, FIG. 2 and FIG. 4. The backplane of the shell 600 is equipped with an electric control component 800, and the other three sides are provided with heat exchangers 700, and the shell 600 is internally equipped with a compressor, pipelines and other components. The upper part of the shell 600 is provided with components such as a motor bracket 500, a motor 100, a wind guide ring 400, a first-stage fan blade 200, a second-stage fan blade 300 and a mesh cover 900, thus forming a counter-cyclone.

Specifically, the rotation direction of the first-stage fan blade 200 is opposite to that of the second-stage fan blade 300. The first-stage fan blade 200 is arranged on the first output shaft 102 of the motor 100, and the second-stage fan is arranged on the second output shaft 104 of the motor 100. Then fix the motor 100 on the air conditioner outdoor unit 1 through the motor bracket 500. The inner diameter of the wind ring main body 412 of the wind guide ring 400 is the same from one end connected with the contraction portion 414 to one end connected with the expansion portion 416, and plays the role of guiding and sealing; the outlet end of the wind guide ring 400 is provided with a mesh cover 900.

When the counter-cyclone is running, the airflow enters the air conditioner outdoor unit 1 through the heat exchanger 700 on the three sides of the shell 600 and passes through components such as the electric control component 800 and the motor bracket 500, then is collected by the wind guide ring 400 and enters the first-stage fan blade 200 and the second-stage fan blade 300, through the pressurization of the two-stage fan blade, finally discharged out of the air conditioner outdoor unit 1 from the mesh cover 900.

FIG. 8 is a part of the structure of the air conditioner outdoor unit 1 shown in FIG. 1, which is used to represent the spatial positional relationship between the fan blade and the motor bracket 500. Setting the axial direction of the output shaft as the axial direction, and in the projected contour line of the fan blade along the axial direction, take the circle corresponding to the largest radius in the contour line corresponding to the fan blade tip as the radius of the fan blade, and the value is R. Thus, the distance between the trailing edge of the first-stage fan blade 200 and the leading edge of the second-stage fan blade 300 is further set to satisfy 0.02R to 2R. When the axial space of the whole machine is limited, the distance between the two-stage fan blades is small, and it can be large when it is not limited. The distance between the leading edge of the first-stage fan blade 200 and the motor bracket 500 opposite to it in the axial direction of the output shaft is the distance between the first-stage fan blade 200 and the motor bracket 500. Its value ranges from 5 mm to 2R, which avoids the possible interference between the fan blade and the motor bracket 500, and prevents the output shaft of the motor 100 from protruding too long, which may cause eccentricity.

Furthermore, as shown in FIG. 7, the motor 100 is provided with two shafts, the first output shaft 102 is a hollow shaft with a shorter length and a larger diameter, on which the first-stage fan blade 200 is mounted; the second output shaft 104 is a solid shaft with a longer length and a smaller diameter, on which a second-stage fan blade 300 is mounted. The rotation directions of the two output shafts are opposite, and the rotation speed can also be different. The rotation speed ratio of the second output shaft 104 to the first output shaft 102 ranges from 0.5 to 2.

Furthermore, combined with the partial structure of the air conditioner outdoor unit 1 shown in FIG. 5 and FIG. 6, set the direction perpendicular to the rotation axis of the fan blade as the radial direction of the fan blade. The distance between the outer periphery of the two-stage fan blade and the radial direction of the wind guide ring 400 ranges from 0.01R to 0.1R. The smaller the radial direction spacing, the higher the fan efficiency, but if the radial direction spacing is too small, the fan blade may interfere with the wind guide ring 400.

Furthermore, the air conditioner outdoor unit 1 also comprises a third-stage fan blade (not shown in the figure). Specifically, the third-stage fan blade is fixed inside the wind guide ring 400 and close to the air outlet end (not shown in the figure), so that the airflow direction is changed when the airflow passing through the third-stage fan blade, and the air supply efficiency is further improved. By setting the third-stage fan blade on the wind guide ring 400, more than two-stage moving blades are used, and the work efficiency is improved by the combination of multi-stage moving blades and stationary blades, and the air outlet effect is improved.

Furthermore, as shown in FIG. 2, FIG. 5 and FIG. 6, the wind guide ring 400 is an asymmetric structure. By setting the radius of the transition arc of the wind guide ring 400 to be 0.01R to 2R, it not only ensures that the air supply efficiency will not be reduced due to an excessively large radius, but also ensures that the transition arc maintains an outwardly expanded shape to facilitate the collection and introduction of airflow. The first-stage fan blade 200 is not completely covered by the wind guide ring 400, the first-stage fan blade 200 is at the height of the unexpanded part of the wind guide ring 400, and the ratio to the height of the first-stage fan blade 200 is the coverage ratio, and the coverage ratio of the first-stage fan blade 200 ranges from 0.1 to 0.9.

The second-stage fan blade 300 is completely covered by the wind guide ring 400, and the outlet of the wind guide ring 400 expands outward to facilitate the recovery of dynamic pressure and increase the efficiency. In addition, the outlet of the wind guide ring 400 may not be expanded.

The location of the electric control component 800 may affect the airflow from the shell 600 to the counter-rotation fan, reducing the performance and efficiency of the counter-rotation fan. Therefore, the axial distance between the electric control component 800 and the motor bracket 500 is set to be greater than 0.1R. The smaller the vertical distance between the electric control component 800 and the corresponding shell 600, the better.

The air conditioner outdoor unit 1 provided in these embodiments adopt a two-stage series design of the first-stage fan blade 200 and the second-stage fan blade 300. After the airflow is accelerated by the first-stage fan blade 200, it is then pressurized by the second-stage fan blade 300, which makes the wind pressure higher and the resistance to wind strong. Secondly, the counter-rotation design is adopted, and the performance is stronger. The rotation speed of the first-stage fan blade 200 and the second-stage fan blade 300 is significantly lower than that of the single axial fan, the working life is long, and the requirement on the structure can also be reduced. Thirdly, the first fan blade and the second-stage fan blade 300 are torque balanced due to the opposite direction of rotation, reducing the vibration of the machine body. And because the rotation speed is significantly reduced, the frequency on the noise spectrum and the resonant single-tone noise are greatly reduced, improving product quality.

The second aspect of the present disclosure provides an air conditioner comprising the air conditioner outdoor unit 1 in any one of the above-mentioned embodiments, thus having all the beneficial effects of the above-mentioned air conditioner outdoor unit 1.

In some specific embodiments, the present disclosure is not limited to the application of the central air conditioner outdoor unit, but can also be used alternatively in other applications such as air purifiers and other single axial fans.

In some specific embodiments, the central air conditioner further comprises an indoor unit, and the indoor unit is connected to the outdoor unit described in any one of the above-mentioned embodiments, so as to adjust the temperature and humidity of the indoor environment.

The air conditioner outdoor unit 1 provided according to the second embodiments of the present disclosure will be described below with reference to FIG. 9 to FIG. 14.

As shown in FIG. 9, some embodiments of the third aspect of the present disclosure provide an air conditioner outdoor unit 1, comprising a first motor 110, a first-stage fan blade 200, a second motor 120, and a second-stage fan blade 300, a first motor bracket 310, a second motor bracket 320, and a shell 600.

Wherein, the first-stage fan blade 200 is connected with an output shaft of the first motor 110, and the first motor 110 is configured to drive the first-stage fan blade 200 to rotate; a rotation axis of the output shaft of the first motor 110 and a rotation axis of the output shaft of the second motor 120 are collinear; the second-stage fan blade 300 is connected with the output shaft of the second motor 120, the second motor 120 is configured to drive the second-stage fan blade 300 to rotate, a rotation direction of the first-stage fan blade 200 is opposite to a rotation direction of the second-stage fan blade 300; the shell 600 is provided with an outlet, the first-stage fan blade 200 and the second-stage fan blade 300 are located at the outlet, the first-stage fan blade 200 is an upstream fan blade, and the second-stage fan blade 300 is a downstream fan blade; the first motor 110 is arranged on the first motor bracket 310, and the second motor 120 is arranged on the second motor bracket 320. The first motor bracket 310 is located on the same side of the first-stage fan blade 200 and the second-stage fan blade 300; or the first motor bracket 310 is located between the first-stage fan blade 200 and the second-stage fan blade 300, the second motor bracket 320 is located on the same side of the first-stage fan blade 200 and the second-stage fan blade 300; or the second motor bracket 320 is located between the first-stage fan blade 200 and the second-stage fan blade 300.

The air conditioner outdoor unit 1 provided by the present disclosure is provided with the first motor 110, the first-stage fan blade 200, the second motor 120 and the second-stage fan blade 300, the first motor bracket 310 and the second motor bracket 320, so that the first motor 110 drives the first-stage fan blade 200 to rotate through the first output shaft, the second motor 120 drives the second-stage fan blade 300 to rotate in reverse through the second output shaft. And because the rotation axes of the output shafts of the first motor 110 and the second motor 120 are collinear, the series arrangement of the two-stage fan blades is realized, and the counter-cyclone of the relative reverse rotation (hereinafter referred to as the counter-rotation) of the first-stage fan blade 200 and the second-stage fan blade 300 is formed. Furthermore, the counter-cyclone is set at the outlet of the shell 600, the first-stage fan blade 200 is used as the upstream fan blade, and the second-stage fan blade 300 is used as the downstream fan blade, that is, along the flow direction of the airflow in the air conditioner outdoor unit, the first-stage fan blade 200 is located upstream of the airflow, the second-stage fan blade 300 is located downstream of the airflow, and through the counter-rotation work of the upstream fan blade and the downstream fan blade, therefore, the rotational energy of the airflow is recovered to achieve greater wind pressure.

Specifically, by adopting the counter-rotation design of the two-stage fan blade, the performance of the motor is enhanced, and at the same time, the rotational speed of the first-stage fan blade 200 and the second-stage fan blade 300 is significantly lower than that of the single axial flow fan of the same level, which increases the service life and reduces the high strength requirement of the fan blade structure at high rotational speed. With these settings, the airflow is supercharged by the combined action of the two-stage fan blade when passing through the air conditioner outdoor unit 1 , so that the wind is strengthened, and improve the resistance to wind, thereby greatly enhancing the exhaust ability of the airflow through the external exhaust duct.

In addition, because the rotation directions of the first-stage fan blade 200 and the second-stage fan blade 300 are opposite, the torque acting on the rotating shaft is relatively balanced, which reduces the vibration of the machine body and the noise caused by vibration, thereby improving the user experience.

Specifically, as shown in FIG. 4, the first motor bracket 310 is located on the same side of the first-stage fan blade 200 and the second-stage fan blade 300; the second motor bracket 320 is located on the same side of the first-stage fan blade 200 and the second-stage fan blade 300; that is, the first-stage fan blade 200 and the second-stage fan blade 300 are located in the middle of the first motor bracket 310 and the second motor bracket 320.

Specifically, it is also possible to place both the first motor bracket 310 and the second motor bracket 320 between the first-stage fan blade 200 and the second-stage fan blade 300 (not shown in the figure). Or one of the first motor bracket 310 and the second motor bracket 320 is located at the first-stage fan blade 200 and the second-stage fan blade 300.

The motor bracket is set in the above-mentioned two ways to support and fix the motor, and realize the adjustment of the relative positions of the motor and the two-stage fan blade according to the size of the interior space of the air conditioner outdoor unit 1 without affecting the performance, so as to ensure a reasonable structural layout.

Furthermore, as shown in FIG. 9 and FIG. 14, the present disclosure provides an air conditioner outdoor unit 1, comprising a first motor 110, a first-stage fan blade 200, a second motor 120, a second-stage fan blade 300, a first motor bracket 310, a second motor bracket 320, a shell 600 and a wind guide ring 400.

Wherein, the first-stage fan blade 200 is connected with an output shaft of the first motor 110, and the first motor 110 is configured to drive the first-stage fan blade 200 to rotate; a rotation axis of the output shaft of the first motor 110 and a rotation axis of the output shaft of the second motor 120 are collinear; the second-stage fan blade 300 is connected with the output shaft of the second motor 120, the second motor 120 is configured to drive the second-stage fan blade 300 to rotate, a rotation direction of the first-stage fan blade 200 is opposite to a rotation direction of the second-stage fan blade 300.

Furthermore, the air conditioner outdoor unit 1 further comprises a first motor bracket 310 and a second motor bracket 320. The first motor 110 is arranged on the first motor bracket 310, and the second motor 120 is arranged on the second motor bracket 320. The first motor bracket 310 is located on the same side of the first-stage fan blade 200 and the second-stage fan blade 300; or the first motor bracket 310 is located between the first-stage fan blade 200 and the second-stage fan blade 300, the second motor bracket 320 is located on the same side of the first-stage fan blade 200 and the second-stage fan blade 300; or the second motor bracket 320 is located between the first-stage fan blade 200 and the second-stage fan blade 300.

Furthermore, the shell 600 is provided with an outlet; the wind guide ring 400 is provided at the outlet, and the first-stage fan blade 200 and the second-stage fan blade 300 are located in the wind guide ring 400. The first motor bracket 310 is connected to the shell 600, and the second motor bracket 320 is connected to the wind guide ring 400 or the shell 600.

In these embodiments, the shell 600 is used to protect the internal structure of the air conditioner outdoor unit 1 from being damaged by external forces. The outlet of the shell 600 is provided with a wind guide ring 400, and the first-stage fan blade 200 and the second-stage fan blade 300 are set in the wind guide ring 400, so that when the airflow passes through the wind guide ring 400, it reaches the outlet after the wind pressure increases through the action of the two-stage fan blade. The first motor bracket 310 and the second motor bracket 320 are connected with the shell 600 or the wind guide ring 400, respectively, so that the motor bracket is fixed on the shell 600 or the wind guide ring 400, making full use of the limited internal space of the air conditioner outdoor unit 1.

Furthermore, specifically, along the direction perpendicular to the rotation axis of the first-stage fan blade 200, project onto the rotation axis, the projection of the second-stage fan blade 300 is completely within the projection of the wind guide ring 400, and the projection of the first-stage fan blade 200 at least partially falls within the wind guide ring 400.

Specifically, both ends of the first motor bracket 310 are fixedly connected to the shell 600, furthermore, both ends of the first motor bracket 310 are provided with mounting holes, and are fixed to the shell 600 by screws.

Specifically, the second motor bracket 320 can also be fixedly connected with the wind guide ring 400, and the second motor bracket 320 is fixed on the wind guide ring through screws or bolts. Or both ends of the second motor bracket 320 are fixedly connected to the shell, and both ends of the second motor bracket 320 are provided with mounting holes, which are fixed to the shell 600 by screws.

Furthermore, the inner diameter of the wind guide ring 400 is set to be equal to make the airflow more smoothly, avoid air leakage, and play the role of guiding and sealing.

Furthermore, the wind guide ring 400 comprises a wind ring main body 412 and a contraction portion 414. One end of the wind ring main body 412 is formed with an air outlet, and the second-stage fan blade 300 is arranged on one side of the wind ring main body close to the air outlet as a downstream fan blade. Specifically, as shown in FIG. 12, the contraction portion 414 is connected to another end of the wind ring main body 412, and forms a transition arc with the wind ring main body 412, so that the wind guide ring 400 can be shrunk when the inner space is not limited to make the structure compact. As shown in FIG. 12, in the direction of both sides of the air conditioner outdoor unit 1, when the space is not limited, the air inlet end of the wind guide ring is shrunk to form a transition arc, which is conducive to the collection and introduction of airflow.

Furthermore, along the axial direction of the output shaft, 10% to 90% of the height of the first-stage fan blade 200 is located in the wind ring main body 412, and/or along the axial direction of the output shaft, the second-stage fan blade 300 is located in the wind ring main body 412.

Specifically, 10% to 90% of the height of the first-stage fan blade 200 is located in the wind ring main body 412 means that along the direction perpendicular to the axial direction, project both the first-stage fan blade 200 and the wind ring main body 412 onto its rotation axis, 10% to 90% of the projection height of the first-stage fan blade 200 on the rotation axis is located in the projection of the wind ring main body 412. When the internal space is limited, the wind ring main body 412 can cover at least a small part of the height of the first-stage fan blade 200 opposite to it, so as to meet the minimum requirement for air supply efficiency, or when the internal space is not limited, the wind ring main body 412 can cover most of the height of the first-stage fan blade 200 opposite to it, ensuring higher air supply efficiency. The second-stage fan blade 300 is located in the wind ring main body 412, that is, it is realized that the wind guide ring 400 completely covers the second-stage fan blade 300. Wherein, the height of the fan blade means that the projection length of the fan blade on its rotation axis along the radial direction of the fan blade.

In any one of the above-mentioned embodiments, furthermore, as shown in FIG. 12, setting a direction perpendicular to the rotation axis of the first-stage fan blade 200 as a radial direction of the first-stage fan blade 200, along the radial direction of the first-stage fan blade 200, a distance from a tip of the first-stage fan blade 200 to an axis of the first-stage fan blade 200 is L1.

As shown in FIG. 12, setting a direction perpendicular to the rotation axis of the second-stage fan blade 300 as a radial direction of the second-stage fan blade 300, along the radial direction of the second-stage fan blade 300, a distance from a tip of the second-stage fan blade 300 to an axis of the second-stage fan blade 300 is L2.

Specifically, along the radial direction of the first-stage fan blade 200, the distance from the tip of the first-stage fan blade 200 to the axis of the first-stage fan blade 200 is L1 means that when projecting the first-stage fan blade 200 along the axial direction of the first-stage fan blade 200, the radius R corresponding to the circle with the largest radius formed in the projected contour line of the first-stage fan blade 200 is the distance L1 from the tip of the first-stage fan blade 200 to the axis of the first-stage fan blade 200.

Specifically, along the radial direction of the second-stage fan blade 300, the distance from the tip of the second-stage fan blade 300 to the axis of the second-stage fan blade 300 is L2 means that When projecting the second-stage fan blade 300 along the axial direction of the second-stage fan blade 300, the radius R corresponding to the circle with the largest radius formed in the projected outline of the second-stage fan blade 300 is the distance L2 from the tip of the second-stage fan blade 300 to the axis of the second-stage fan blade 300.

Furthermore, setting an axial distance between the first-stage fan blade 200 and the second-stage fan blade 300 ranges from 0.02×L1 to 2×L1; or an axial distance between the first-stage fan blade 200 and the second-stage fan blade 300 ranges from 0.02×L2 to 2×L2. As shown in FIG. 12, along the air intake direction, the first fan blade comprises the leading edge and the trailing edge, the second-stage fan blade comprises the leading edge and the trailing edge, the axial distance L3 between the first-stage fan blade 200 and the second-stage fan blade 300 is the distance between the trailing edge of the first-stage fan blade 200 and the leading edge of the second-stage fan blade 300. The reasonable setting of the axial distance makes the axial spacing of the two-stage fan blades have sufficient distance to avoid the possible interference of the two-stage fan blades, and at the same time the performance degradation and other structural problems caused by the excessive axial spacing of the two-stage fan blades are avoided.

Furthermore, setting an axial distance between the first-stage fan blade 200 and the second-stage fan blade 300 ranges from 0.05×L1 to 0.3×L1; or an axial distance between the first-stage fan blade 200 and the second-stage fan blade 300 ranges from 0.05×L2 to 0.3×L2.

Specifically, as shown in FIG. 10, the distance L1 from the tip of the first-stage fan blade 200 to the axis of the first-stage fan blade 200 can be set to be the same as the distance L2 from the tip of the second-stage fan blade 300 to the axis of the second-stage fan blade 300 to reduce the production mold and reduce the production cost.

Furthermore, as shown in FIG. 12, setting an axial distance L4 between the first-stage fan blade 200 and the first motor bracket 310 ranges from 5 mm to 2×L1; or an axial distance L5 between the second-stage fan blade 300 and the second motor bracket 320 ranges from 5 mm to 2×L2. By setting the above-mentioned value range of the axial distance between the first-stage fan blade 200 or the second-stage fan blade 300 and the motor bracket, the fan blade and the motor bracket have sufficient distance to avoid interference between the fan blade and the motor bracket. By limiting the length of the motor shaft, the eccentricity caused by the extension of the motor shaft is avoided.

Furthermore, setting an axial distance between the first-stage fan blade 200 and the first motor bracket 310 ranges from 5 mm to 0.5×L1; or an axial distance between the second-stage fan blade 300 and the second motor bracket 320 ranges from 5 mm to 0.5×L2.

As shown in FIG. 9 and FIG. 11, in any one of the above-mentioned embodiments, furthermore, as shown in FIG. 12, FIG. 13 and FIG. 14, along the radial direction of the first-stage fan blade 200, the distance B1 from the tip of the first-stage fan blade 200 to the wind guide ring 400 ranges from 0.01×L1 to 0.1×L1; and/or along the radial direction of the second-stage fan blade 300, the distance B2 between the tip of the second-stage fan blade 300 and the wind guide ring 400 ranges from 0.01×L2 to 0.1×L2. It avoids the possible interference between the fan blade and the wind guide ring 400 due to the distance being too close, and avoids the reduction of the fan efficiency due to the fan blade and the wind guide ring 400 being too far.

Furthermore, setting the distance B1 from the tip of the first-stage fan blade 200 to the wind guide ring 400 ranges from 0.025×L1 to 0.055×L1; and/or along the radial direction of the second-stage fan blade 300, the distance B2 between the tip of the second-stage fan blade 300 and the wind guide ring 400 ranges from 0.025×L2 to 0.055×L2. Furthermore, as shown in FIG. 12, the value range of the corresponding radius r of the transition arc is defined to be 0.01×L1 to 2×L1. So that the contraction portion 414 of the wind guide ring 400 cannot reduce the air supply efficiency because the radius of the transition arc is too large. At the same time, the contraction portion 414 of the wind guide ring 400 also maintains an outwardly expanded shape in the smallest state, so as to facilitate the collection and introduction of airflow.

Furthermore, the corresponding radius r of the transition arc ranges from 0.1×L1 to 0.5×L1, in order to facilitate the collection and introduction of airflow.

Furthermore, the air outlet end of the wind guide ring 400 is provided with an expansion portion extending outside the wind guide ring 400, so that the airflow will expand outward when passing through the air outlet end. Furthermore, the wind speed is reduced, the resistance is reduced, and the energy loss is reduced, which facilitates the recovery of dynamic pressure and improves the air supply efficiency. The second motor bracket 320 is located outside the wind guide ring 400, which ensures that when the two-stage fan blades are set relative to each other in the wind guide ring 400, there is no other structure in the middle, and the ventilation is smooth.

As shown in FIG. 9, in any one of the above-mentioned embodiments, furthermore, the air conditioner outdoor unit 1 further comprises a mesh cover 900; the mesh cover 900 is arranged on the air outlet end of the wind guide ring 400.

In these embodiments, the mesh cover 900 is arranged at the air outlet end of the wind guide ring 400, on one hand, it prevents external debris from entering the wind guide ring 400 and causes abnormal operation of the fan, and effectively protects the components inside the wind guide ring 400 from damage. On the other hand, it avoids the danger of people or other animals touching the fan when the air conditioner outdoor unit 1 is working, thereby improving the safety of the air conditioner outdoor unit 1.

Furthermore, the second motor bracket 320 and the mesh cover 900 are an integral structure. In this way, the structure is more compact, and at the same time, the process of disassembling and assembling the second motor bracket 320 is avoided, and the installation time is saved.

Furthermore, as shown in FIG. 11, the air conditioner outdoor unit 1 further comprises a shell cover 902. The shell cover 902 is provided with the mesh cover 900, which is connected with the shell 600, and covers the air outlet end of the wind guide ring 400, forming a complete shell of the air conditioner outdoor unit 1 with the shell 600. Therefore, the external environment and the interior of the air conditioner outdoor unit 1 are isolated to a certain extent, and the internal structure of the air conditioner outdoor unit 1 is effectively protected. At the same time, the danger caused by people or other animals touching the fan when the air conditioner outdoor unit 1 is working is avoided, and the safety of the air conditioner outdoor unit 1 is improved. The second motor bracket 320 is arranged in the shell cover 902, so that the second motor bracket 320 is protected by the shell cover 902 and does not affect the normal ventilation in the wind guide ring 400, so that the airflow is expelled from the mesh cover 900 without loss after passing through the wind guide ring 400 and the second motor bracket 320.

Specifically, the mesh cover 900 can adopt a square structure to fit the shell cover 902.

Furthermore, as shown in FIG. 9 and FIG. 11, the air conditioner outdoor unit 1 also comprises a heat exchanger 700 and an electric control component 800. Specifically, the heat exchanger 700 is located between the air inlet and outlet of the shell 600, and the three sides of the shell 600 are provided with heat exchangers 700 correspondingly. The airflow can enter the air conditioner outdoor unit 1 through the heat exchanger 700 from multiple directions, which improves the air supply efficiency. And set the electric control component 800 on the shell 600.

Specifically, as shown in FIG. 9 and FIG. 11, the front, left and right sides of the whole air conditioner outdoor unit 1 are equipped with heat exchangers 700, and the electric control component 800 is set on the backplane, which realizes air intake from three sides, and it is discharged from the wind guide ring 400 to improve the working efficiency of the air conditioner outdoor unit 1.

Furthermore, the setting position of the electric control component 800 can be set at the lower part of the backplane, and a heat exchanger 700 can be added to the upper part of the backplane, so that the air conditioner outdoor unit 1 can be supplied with air from all sides.

Specifically, as shown in FIG. 9 to FIG. 11, the air conditioner outdoor unit 1 has side air inlet and top air outlet. In the specific implementation, the air outlet can also be set on the side of the shell 600, so as to realize the air inlet from the top and the other sides. The specific structure can be set according to the specific situation, and is not limited to this.

Specifically, the electric control component 800 may also be arranged outside the shell 600, or at least a part thereof may be arranged outside the shell 600.

Furthermore, as shown in FIG. 12 or FIG. 13, along the axial direction of the output shaft, the distance between the electric control component 800 and the motor bracket is set to be greater than 0.02×L1, so as to avoid the reduction of air supply efficiency due to obstruction of airflow.

Specifically, it is also possible to set a third-stage fan blade on the wind guide ring 400 as a stationary blade, and use a blade with more than two-stage to improve the air supply efficiency through the combination of multi-stage moving blades and stationary blades.

Furthermore, the air conditioner outdoor unit 1 also comprises a third-stage fan blade (not shown in the figure). Specifically, the third-stage fan blade is fixed inside the wind guide ring 400 and close to the air outlet end (not shown in the figure), so that the airflow direction is changed when the airflow passing through the third-stage fan blade, and the air supply efficiency is further improved. By setting the third-stage fan blade on the wind guide ring 400, more than two-stage moving blades are used, and the work efficiency is improved by the combination of multi-stage moving blades and stationary blades, and the air outlet effect is improved.

In the specific embodiments, the structure of the air conditioner outdoor unit 1 is shown in FIG. 9 and FIG. 11. The backplane of the shell 600 is equipped with an electric control component 800, and the other three sides are provided with heat exchangers 700, and the shell 600 is internally equipped with a compressor, pipelines and other components. The upper part of the shell 600 is provided with components such as a first motor bracket 310, a first motor 110, a wind guide ring 400, a first-stage fan blade 200, a second-stage fan blade 300, a second motor bracket 320, a second motor 120 and a mesh cover 900, thus forming a counter-cyclone.

Specifically, the first-stage fan blade 200 is arranged on the first motor 110, the first motor 110 is fixed on the air conditioner outdoor unit 1 by the first motor bracket 310, the second-stage fan blade 300 is arranged on the second motor 120, and the second motor 120 is fixed on the air conditioner outdoor unit 1 by the second motor bracket 320. The first-stage fan blade 200 and the second-stage fan blade 300 rotate in opposite directions. The inner diameter of the wind guide ring 400 is the same, which has the function of guiding and sealing. A square shell cover 902 is arranged at the outlet end of the wind guide ring 400 to cover the second motor bracket 320, so that the airflow passes through the wind guide ring 400 and the second motor bracket 320 and is discharged from the mesh cover 900. The mesh cover 900 is arranged on the shell cover 902 to prevent foreign matter from entering the air conditioner outdoor unit 1.

When the counter-cyclone is running, the airflow enters the air conditioner outdoor unit 1 through the heat exchangers 700 on the three sides of the shell 600 and passes through components such as the electric control component 800 and the first motor bracket 310, then is collected by the wind guide ring 400 and enters the first-stage fan blade 200 and the second-stage fan blade 300, through the pressurization of the two-stage fan blade, finally discharged out of the air conditioner outdoor unit 1 from the mesh cover 900.

FIG. 14 is a part of the structure of the air conditioner outdoor unit 1 shown in FIG. 9, which is used to represent the spatial positional relationship between the fan blade and the motor bracket. Setting the axial direction of the output shaft as the axis direction, and the distance between the tip of the fan blade and the axis as the radius of the fan blade, and the value is R. Therefore, the distance between the trailing edge of the first-stage fan blade 200 and the leading edge of the second-stage fan blade 300 is further set as the axial distance of the two-stage fan blade, and its value ranges from 0.02R to 2R. When the axial space of the whole machine is limited, the distance between the two-stage fan blades is small, and it can be larger when it is not limited. The distance between the periphery edge of the first-stage fan blade 200 and the projection of the first motor bracket 310 opposite to it on the axis of the output shaft is set as the distance between the first-stage fan blade 200 and the first motor bracket 310, and its value range is 5 mm to 2R. The interference between the first-stage fan blade 200 and the first motor bracket 310 is avoided, and the output shaft of the first motor 110 is prevented from extending too long to cause eccentricity. Similarly, the distance between the peripheral edge of the second-stage fan blade 300 and the projection of the second motor bracket 320 opposite to it on the axis of the output shaft is set as the distance between the second-stage fan blade 300 and the second motor bracket 320, its value range is 5 mm to 2R.

Furthermore, combined with the partial structure of the air conditioner outdoor unit 1 shown in FIG. 12 and FIG. 13, set the direction perpendicular to the rotation axis of the fan blade as the radial direction of the fan blade. The distance between the two-stage fan blade and the radial direction of the wind guide ring 400 ranges from 0.01R to 0.1R. The smaller the radial direction spacing, the higher the fan efficiency, but if the radial direction spacing is too small, the fan blade may interfere with the wind guide ring 400.

Furthermore, as shown in FIG. 12 and FIG. 13, the wind guide ring 400 is an asymmetric structure. By setting the radius of the transition arc of the wind guide ring 400 to be 0.01R to 2R, it not only ensures that the air supply efficiency will not be reduced due to an excessively large radius, but also ensures that the transition arc maintains an outwardly expanded shape to facilitate the collection and introduction of airflow. The first-stage fan blade 200 is not completely covered by the wind guide ring 400, The first-stage fan blade 200 is at the height of the unexpanded part of the wind guide ring 400, and the ratio to the height of the first-stage fan blade 200 is the coverage ratio, and the coverage ratio of the first-stage fan blade 200 ranges from 0.1 to 0.9.

The second-stage fan blade 300 is completely covered by the wind guide ring 400, and the wind guide ring 400 is located below the second motor bracket 320. The outlet of the wind guide ring 400 expands outwards, which is convenient to recover the dynamic pressure and increase the efficiency. In addition, the outlet of the wind guide ring 400 may not be expanded. The mesh cover 900 and the shell cover 902 can be adjusted and improved accordingly according to the outlet form of the wind guide ring 400.

The location of the electric control component 800 may affect the airflow from the shell 600 to the counter-rotation fan, reducing the performance and efficiency of the counter-rotation fan. Therefore, the axial distance between the electric control component 800 and the motor bracket is set to be greater than 0.02R, the radius of the fan blade is taken as the distance between the tip of the fan blade and the axis, and the value is R. The smaller the vertical distance between the electric control component 800 and the corresponding shell 600, the better.

The air conditioner outdoor unit 1 provided in these embodiments adopts a two-stage series design of the first-stage fan blade 200 and the second-stage fan blade 300. After the airflow is accelerated by the first-stage fan blade 200, it is then pressurized by the second-stage fan blade 300, which makes the wind pressure higher and the resistance to wind strong. Secondly, the counter-rotation design is adopted, and the performance is stronger. The rotation speed of the first-stage fan blade 200 and the second-stage fan blade 300 is significantly lower than that of the single axial fan, the working life is long, and the requirement on the structure can also be reduced. Thirdly, the first fan blade and the second-stage fan blade 300 are torque balanced due to the opposite direction of rotation, reducing the vibration of the machine body. And because the rotation speed is significantly reduced, the frequency on the noise spectrum and the resonant single-tone noise are greatly reduced, improving product quality.

The fourth aspect of the present disclosure provides an air conditioner comprising the air conditioner outdoor unit 1 in any one of the above-mentioned embodiments, thus having all the beneficial effects of the above-mentioned air conditioner outdoor unit 1.

In some specific embodiments, the present disclosure is not limited to the application of the central air conditioner outdoor unit, but can be used alternatively in other applications such as air purifiers and other single axial flow fans.

In some specific embodiments, the central air conditioner further comprises an indoor unit, and the indoor unit is connected to the air conditioner outdoor unit described in any one of the above-mentioned embodiments, so as to adjust the temperature and humidity of the indoor environment.

In the description of the present disclosure, the term “a plurality of” means two or more, unless otherwise explicitly defined, it should be understood that the orientation or position relationships indicated by the terms “upper”, “lower”, “left”, “right”, “front”, “back” and the like are the orientation or position relationships based on what is shown in the drawings, are merely for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the device or unit referred to must have a particular direction and is constructed and operated in a specific orientation, and thus cannot be understood as the limitation of the present disclosure. The terms “connection”, “installing”, “fixing” and the like should be understood in a broad sense. For example, “connection” may be a fixed connection, a removable connection or an integral connection; and “connected” may refer to direct connection or indirect connection through an intermediary. A person of ordinary skills in the art could understand the specific meaning of the terms in the present disclosure according to specific situations.

In the description of the present specification, the descriptions of the terms “one embodiment”, “some embodiments” and “specific embodiments” and the like mean that specific features, structures, materials or characteristics described in conjunction with the embodiment(s) or example(s) are comprised in at least one embodiment or example of the present disclosure. In the specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples.

The descriptions above are only preferred embodiments of the present disclosure, which are not used to limit the present disclosure. For a person skilled in the art, the present disclosure may have various changes and variations. Any modifications, equivalent substitutions, improvements etc. within the spirit and principle of the present disclosure shall all be comprised in the protection scope of the present disclosure. 

What is claimed is:
 1. An air conditioner outdoor unit, comprising: a motor, being provided with a first output shaft and a second output shaft; a first-stage fan blade, being connected to the first output shaft; a second-stage fan blade, being connected to the second output shaft; a shell, being provided with an outlet, the first-stage fan blade and the second-stage fan blade being located at the outlet, the first-stage fan blade being an upstream fan blade, and the second-stage fan blade being a downstream fan blade; and a motor bracket, being connected to the shell, and the motor being arranged on the motor bracket, wherein, the motor is configured to drive the first-stage fan blade and the second-stage fan blade to rotate, and rotation directions of the first-stage fan blade and the second-stage fan blade are opposite; and the motor is located between the first-stage fan blade and the second-stage fan blade; or the motor is located on the same side of the first-stage fan blade and the second-stage fan blade.
 2. The air conditioner outdoor unit according to claim 1, wherein a rotation axis of the first output shaft and a rotation axis of the second output shaft are collinear.
 3. The air conditioner outdoor unit according to claim 1, wherein the first output shaft is a hollow shaft, and the second output shaft passes through the hollow shaft.
 4. The air conditioner outdoor unit according to claim 1, wherein a rotation speed ratio of the second output shaft and the first output shaft ranges from 0.5 to
 2. 5. The air conditioner outdoor unit according to claim 1, further comprising: a wind guide ring, being arranged at the outlet, and the first-stage fan blade and the second-stage fan blade are arranged in the wind guide ring.
 6. The air conditioner outdoor unit according to claim 5, wherein the wind guide ring comprises: a wind ring main body, one end of the wind ring main body forming an air outlet end; and a contraction portion, being connected to another end of the wind ring main body, and a transition arc being formed between the contraction portion and the wind ring main body, wherein, a circle center of the transition arc is located outside the wind guide ring.
 7. The air conditioner outdoor unit according to claim 6, wherein along an axial direction of the first output shaft, 10% to 90% of a height of the first-stage fan blade is located in the wind ring main body.
 8. The air conditioner outdoor unit according to claim 6, wherein taking a direction perpendicular to a rotation axis of the first-stage fan blade as a radial direction of the first-stage fan blade, along the radial direction of the first-stage fan blade, a distance from a tip of the first-stage fan blade to an axis of the first-stage fan blade is L1, a corresponding radius of the transition arc ranges from 0.01×L1 to 2×L1.
 9. The air conditioner outdoor unit according to claim 1, wherein taking a direction perpendicular to a rotation axis of the first-stage fan blade as a radial direction of the first-stage fan blade, along the radial direction of the first-stage fan blade, a distance from a tip of the first-stage fan blade to an axis of the first-stage fan blade is L1; and taking a direction perpendicular to a rotation axis of the second-stage fan blade as a radial direction of the second-stage fan blade, along the radial direction of the second-stage fan blade, a distance from a tip of the second-stage fan blade to an axis of the second-stage fan blade is L2, an axial distance between the first-stage fan blade and the motor bracket ranges from 5 mm to 2×L1; or an axial distance between the second-stage fan blade and the motor bracket ranges from 5 mm to 2×L2.
 10. The air conditioner outdoor unit according to claim 5, wherein taking a direction perpendicular to a rotation axis of the first-stage fan blade as a radial direction of the first-stage fan blade, along the radial direction of the first-stage fan blade, a distance from a tip of the first-stage fan blade to an axis of the first-stage fan blade is L1; and taking a direction perpendicular to a rotation axis of the second-stage fan blade as a radial direction of the second-stage fan blade, along the radial direction of the second-stage fan blade, a distance from a tip of the second-stage fan blade to an axis of the second-stage fan blade is L2, along the radial direction of the first-stage fan blade, a distance from the tip of the first-stage fan blade to the wind guide ring ranges from 0.01×L1 to 0.1×L1; and/or along the radial direction of the second-stage fan blade, a distance from the tip of the second-stage fan blade to the wind guide ring ranges from 0.01×L2 to 0.1×L2.
 11. The air conditioner outdoor unit according to claim 6, wherein the wind guide ring further comprises an expansion portion, being connected to the air outlet end of the wind ring main body.
 12. The air conditioner outdoor unit according to claim 6, further comprising: a mesh cover, being arranged at the air outlet end of the wind guide ring.
 13. The air conditioner outdoor unit according to claim 5, further comprising: a heat exchanger, being arranged in the shell, and the heat exchanger being located between an air inlet and an outlet of the shell, and an electric control component is arranged on the shell, wherein taking a direction perpendicular to a rotation axis of the first-stage fan blade as a radial direction of the first-stage fan blade, along the radial direction of the first-stage fan blade, a distance from a tip of the first-stage fan blade to an axis of the first-stage fan blade is L1, along an axial direction of the first output shaft, a distance between the electric control component and the motor bracket is greater than 0.02×L1.
 14. The air conditioner outdoor unit according to claim 6, further comprising: a third-stage fan blade, being arranged on the wind guide ring and located at the air outlet end of the wind guide ring.
 15. The air conditioner outdoor unit according to claim 1, wherein taking a direction perpendicular to a rotation axis of the first-stage fan blade as a radial direction of the first-stage fan blade, along the radial direction of the first-stage fan blade, a distance from a tip of the first-stage fan blade to an axis of the first-stage fan blade is L1; and taking a direction perpendicular to a rotation axis of the second-stage fan blade as a radial direction of the second-stage fan blade, along the radial direction of the second-stage fan blade, a distance from a tip of the second-stage fan blade to an axis of the second-stage fan blade is L2, an axial distance between the first-stage fan blade and the second-stage fan blade ranges from 0.02×L1 to 2×L1; or an axial distance between the first-stage fan blade and the second-stage fan blade ranges from 0.02×L2 to 2×L2.
 16. An air conditioner outdoor unit, comprising: a first motor; a first-stage fan blade, being connected with an output shaft of the first motor, and the first motor being configured to drive the first-stage fan blade to rotate; a second motor, a rotation axis of the output shaft of the first motor and a rotation axis of the output shaft of the second motor being collinear; a second-stage fan blade, being connected with the output shaft of the second motor, the second motor being configured to drive the second-stage fan blade to rotate, a rotation direction of the first-stage fan blade being opposite to a rotation direction of the second-stage fan blade; a shell, being provided with an outlet, the first-stage fan blade and the second-stage fan blade being located at the outlet, the first-stage fan blade being an upstream fan blade, and the second-stage fan blade being a downstream fan blade; a first motor bracket, the first motor being arranged on the first motor bracket, and the first motor bracket being connected with the shell; and a second motor bracket, the second motor being arranged on the second motor bracket, and the second motor bracket being connected with the shell, wherein, the first motor bracket is located on the same side of the first-stage fan blade and the second-stage fan blade; or the first motor bracket is located between the first-stage fan blade and the second-stage fan blade, the second motor bracket is located on the same side of the first-stage fan blade and the second-stage fan blade; or the second motor bracket is located between the first-stage fan blade and the second-stage fan blade.
 17. The air conditioner outdoor unit according to claim 16, further comprising: a wind guide ring, being arranged at the outlet and the first-stage fan blade and the second-stage fan blade being located in the wind guide ring.
 18. The air conditioner outdoor unit according to claim 17, wherein the wind guide ring comprises: a wind ring main body, one end of the wind ring main body forming an air outlet end; and a contraction portion, one end of the contraction portion being connected with another end of the wind ring main body, and a transition arc being formed between the contraction portion and the wind ring main body, wherein, a circle center of the transition arc is located outside the wind guide ring.
 19. The air conditioner outdoor unit according to claim 18, wherein along an axial direction of the output shaft, 10% to 90% of a height of the first-stage fan blade is located in the wind ring main body; and/or along the axial direction of the output shaft, the second-stage fan blade is located in the wind ring main body.
 20. The air conditioner outdoor unit according to claim 18, wherein the air outlet end of the wind guide ring is provided with an expansion portion extending outside the wind guide ring, when the second motor bracket is located on the same side of the first-stage fan blade and the second-stage fan blade, the second motor bracket is located outside the wind guide ring. 